We've done a quick review of how many are out there that are still current. What usually happens is you're given authorization that says, go ahead, you can build a structure, but there are conditions on that. The condition is you must provide compensation or offsetting. You must monitor that the compensation is working. You must report to us.
We do about 450 authorizations a year. We've looked back, and since 2008 there are about 275 that are still active in terms of requirements for a company or a proponent to monitor, or report, or something. So it's not a huge number out there, but it's really just those ones that are still active. It's about 275 since 2008.